In the present study, the potential of sugarcane bagasse (SCB) was evaluated by methylene blue (MB) retention. The selected low-cost adsorbent was characterized by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), BET method, and determination of the point of zero charge (pHzpc). Batch kinetic and isothermal studies were performed to examine the effects of contact time, initial dye concentration, adsorbent dose, pH, and temperature. The results show that the kinetic study of MB adsorption on sugarcane bagasse is very fast; the equilibrium is reached after only 20 minutes. The kinetic model of pseudo-second-order and the Langmuir isotherm model perfectly explain the adsorption process of MB with a monolayer adsorption capacity equal to 49.261 mg·g⁻¹ activation parameters’ values such as free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) also determined as −4.35 kJ·mol⁻¹, −31.062 kJ·mol⁻¹, and −0.084 J·mol⁻¹·K⁻¹, respectively. Besides, the thermodynamic parameters of the methylene blue sugarcane bagasse system indicate that the exothermic adsorption process is spontaneous.

中文翻译：

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利用甘蔗渣去除废水中的有机染料

在本研究中，甘蔗渣 (SCB) 的潜力通过亚甲蓝 (MB) 保留来评估。选定的低成本吸附剂通过扫描电子显微镜 (SEM) 结合能量色散 X 射线光谱 (EDX)、傅里叶变换红外光谱 (FTIR)、BET 方法和零电荷点 (pHzpc) 的测定进行表征. 进行批次动力学和等温研究以检查接触时间、初始染料浓度、吸附剂剂量、pH 值和温度的影响。结果表明，MB在甘蔗渣上的吸附动力学研究很快；仅在 20 分钟后达到平衡。拟二级动力学模型和Langmuir等温线模型完美地解释了MB的吸附过程，单层吸附容量为49.261 mg·g^-1活化参数的值，例如自由能 (Δ G °)、焓 (Δ H °) 和熵 (Δ S °) 也确定为 -4.35 kJ·mol ^-1、-31.062 kJ·mol ^-1和-0.084 J·mol ^-1 ·K ^-1分别。此外，亚甲基蓝甘蔗渣系统的热力学参数表明放热吸附过程是自发的。